/Engine/Source/Runtime/Engine/Classes/Components/SkyLightComponent.h
Computes a radiance map using only emissive contribution from the sky light.
void CaptureEmissiveRadianceEnvironmentCubeMap ( FSHVectorRGB3 & OutIrradianceMap, [TArray](API\Runtime\Core\Containers\TArray)< [FFloat16Color](API\Runtime\Core\Math\FFloat16Color) > & OutRadianceMap ) const